Negative insert for cutting machining
A negative insert for cutting machining has a top side, a clearance side perpendicular thereto and a cutting edge in a region interconnecting these sides and extending substantially in parallel with these sides. The insert has further a flat or rounded chamfer connecting the cutting edge to the clearance side on at least one lateral side of the insert in the region of a corner thereof. The chamfer makes an angle of 1°-15° with the clearance side for enabling application of the chamfer substantially tangentially to a work piece to be machined for bearing of the insert in two dimensions against the work piece during cutting machining operation carried out by the insert.
1. A negative insert for cutting machining having a top side, a bottom side, a clearance side perpendicular to the top side and extending around an entire periphery of the insert and between the top side and the bottom side, and a cutting edge between the top side and the clearance side, wherein a flat or rounded chamfer connects the cutting edge to the clearance side on at least one lateral side of the insert in the region of a corner thereof, and the chamfer makes an angle of 1°-15° with the clearance side for enabling application of the chamfer substantially tangentially to a work piece to be machined for bearing of the insert in two dimensions against the work piece during cutting machining operation carried out by the insert.
2. An insert according to claim 1 , wherein the insert is a turning insert.
3. An insert according to claim 1 , wherein the insert is a milling insert.
4. An insert according to claim 1 , wherein the chamfer makes an angle of 1°-10° or 3°-8° with the clearance side.
5. An insert according to claim 1 , wherein the chamfer makes an angle of 1°-10° or 3°-8° with the clearance side.
6. An insert according to claim 1 , wherein the extension of the chamfer from the cutting edge to the clearance side is 0.03 mm-0.30 mm.
7. An insert according to claim 1 , wherein the extension of the chamfer from the cutting edge to the clearance side is 0.03 mm-0.20 mm.
8. An insert according to claim 1 , wherein the extension of the chamfer from the cutting edge to the clearance side is 0.04 mm-0.15 mm.
9. An insert according to claim 1 , wherein the extension of the chamfer from the cutting edge to the clearance side is 0.04 mm-0.08 mm.
10. An insert according to claim 1 , wherein the chamfer is rounded with a radius r>10 mm.
11. An insert according to claim 1 , wherein the chamfer is rounded with a radius r, where 10 mm<r<100 mm.
12. An insert according to claim 1 , wherein the chamfer is rounded with a radius r, where [r] 10 mm<r<50 mm.
13. An insert according to claim 1 , wherein the chamfer extends from the corner over at least substantially half the distance to an adjacent corner of the insert.
14. An insert according to claim 1 , wherein the chamfer connects the cutting edge to the clearance side on both lateral sides of the insert joined by the corner of the insert.
15. An insert according to claim 1 , wherein the insert has a chamfer connecting the cutting edge to the clearance side in the region of more than one corner of the insert.
16. An insert according to claim 1 , wherein it is provided with a convex wiper edge at least at one corner thereof, the wiper edge being defined by at least one radius.
17. An insert according to claim 1 , wherein at least the portions thereof intended to be applied to a work piece to be machined are made of boron nitride.
18. An insert according to claim 17 , wherein the boron nitride is cubic boron nitride.
19. An insert according to claim 17 , wherein the boron nitride is poly crystalline boron nitride.
20. An insert according to claim 1 , wherein the insert has a surface separating the cutting edge from the top side and making an angle to the top side of less than 40°.
21. An insert according to claim 1 , wherein the chamfer is convexly rounded.